When Chicagoan Russell Stone finds himself teaching a Creative Nonfiction class, he encounters a young Algerian woman with a disturbingly luminous presence. Thassadit Amzwar's blissful exuberance both entrances and puzzles the melancholic Russell. How can this refugee from perpetual terror be so happy? Won't someone so open and alive come to serious harm? Wondering how to protect her, Russell researches her war-torn country and skims through popular happiness manuals. Might her condition be hyperthymia? Hypomania? Russell's amateur inquiries lead him to college counselor Candace Weld, who also falls under Thassa's spell. Dubbed Miss Generosity by her classmates, Thassa's joyful personality comes to the attention of the notorious geneticist and advocate for genomic enhancement, Thomas Kurton, whose research leads him to announce the genotype for happiness.Russell and Candace, now lovers, fail to protect Thassa from the growing media circus. Thassa's congenital optimism is soon severely

Exuberance carries us places we would not otherwise go-across the savannah, to the moon, into the imagination-and if we ourselves are not so exuberant we will, caught up by the contagious joy of those who are, be inclined collectively to go yonder.

– Kay Redfield Jamison, Exuberance

A man rides backward in a packed subway car. This must be almost fall, the season of revision. I picture him in the thick of bequest, tunneling beneath the I Will City, the world’s twenty-fifth biggest urban sprawl, one wedged in the population charts between Tianjin and Lima. He hums some calming mantra to himself, a song with the name Chicago in it, but the train drowns out the tune.

He’s just thirty-two, I know, although he seems much older. I can’t see him well, at first. But that’s my fault, not his. I’m years away, in another country, and the El car is so full tonight that everyone’s near invisible.

Look again: the whole point of heading out anywhere tonight. The blank page is patient, and meaning can wait. I watch until he solidifies. He cowers in the scoop seat, knees tight and elbows hauled in. He’s dressed for being overlooked, in rust jeans, maroon work shirt, and blue windbreaker with broken zipper: the camouflage of the non- aligned, circa last year. He’s as white as anyone on this subway gets. His own height surprises him. His partless hair waits for a reprimand and his eyes halt midway between hazel and brown. His face is about six centuries out of date. He would make a great Franciscan novice in one of those mysteries set in a medieval monastery.

He cups a bag of ratty books on his lap. No; look harder: a ruggedized plastic sack inscribed with bright harvest cornucopia that issues the trademarked slogan, Total Satisfaction plus so much more!

His spine curls in subway contrition, and his shoulders apologize for taking up any public space at all. His chin tests the air for the inevitable attack that might come from any direction. I’d say he’s headed to his next last chance. He tries to give his seat to a young Latina in a nurse’s uniform. She just smirks and waves him back down.

Early evening, four dozen feet below the City on the Make: every minute, the train tunnels underneath more humans than would fit in a fundamentalist’s heaven. Aboveground, it must be rainy and already dark. The train stops and more homebound workers press in, trickling September drizzle. This is the fifth year since the number of people living in cities outstripped those who don’t.

I watch him balance a yellow legal pad on his toppling book sack. He checks through the pages, curling each back over the top of the pad. The sheets fill with blocks of trim handwriting. Red and green arrows, nervous maneuvers and counter-maneuvers, swarm over the text.

A forest of straphangers hems him in. Many are wired for sound. A damp man next to him drips on his shoes. Humanity engulfs him: phone receptionists for Big Four accounting firms. Board of Trade pit bulls, burned out by twenty-eight. Market researchers who’ve spent days polling focus groups on the next generation of portable deionizers. Purveyors and contractors, drug dealers, number crunchers, busboys, grant writers. Just brushing against them in memory makes me panic.

Advertisements crown the car’s walls: Outpsych your tyke. Want to know what makes the planet tick? Make your life just a little perfecter. Every few minutes, a voice calls over the speakers: “If you observe any suspicious behavior or unattended packages ”

I force my eyes back down over the scribbler’s left shoulder, spying on his notes. The secret of all imagination: theft. I stare at his yellow legal pages until they resolve. They’re full of lesson plans.

I know this man. He’s been fished from the city’s adjunct-teacher pool, an eleventh-hour hire, still working on his first night’s class even as the train barrels toward his South Loop station. The evidence is as clear as his all-caps printing: ethics has wrecked his life, and this fluke part-time night job is his last hope for rehabilitation. He never expected to land such a plum again. Death and resurrection: I know this story, like I wrote it myself.

The train wags, he pitches in his seat, and I don’t know anything. I stop deciding and return to looking. A heading on the top of his pad’s first page reads: Creative Nonfiction 14, Sect. RS: Journal and Journey.

A heavy teen in a flak jacket bumps him. He squeezes out a retreating smile. Then he resumes drawing red arrows, even now, two subway stops from his first night’s class. As I always say: It’s never too late to overprepare. His pen freezes in midair; he looks up. I glance away, caught spying. But his hand just hovers. When I look back, he’s the one who’s spying on someone else.

He’s watching a dark-haired boy across the aisle, a boy with a secret quickening in his hands. Something yellow floats on the back of the boy’s curled fist. His two knuckles pin a goldfinch by the ankles. The boy quiets the bird, caressing in a foreign tongue.

My adjunct’s hand holds still, afraid that his smallest motion will scatter this scene. The boy sees him looking, and he hurries the bird back into a bamboo cylinder. My spy flushes crimson and returns to his notes.

I watch him shuffle pages, searching for a passage in green highlighter that reads First Assignment. The words have been well worked over. He strikes them out once more and writes: Find one thing in the last day worth telling a total stranger.

Clearly he’s terrified there may be no such thing. I see it in his spine: he’ll bother no one with his day’s prize, least of all a total stranger.

It’s up to me to write his assignment for him. To describe the thing that this day will bring, the one that will turn life stranger than total.

He gets out at Roosevelt, the Wabash side. He struggles up the stairs against the evening human waterfall. Remnants of the day shift still pour underground, keen on getting home tonight at a reasonable hour. Home before the early autumn rains wash away their subdivision. Home before Nikkei derivatives trigger a Frankfurt DAX panic.